Should states test marijuana for potency, purity and safety?

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FILE - This April 4, 2013 file photo shows Mike Steenhout, right, comptroller of Washington's Liquor Control Board, watching as Eden Labs founder Fritz Chess talks about a closed extraction system at his lab in Seattle. With Oregon, Washington and Colorado all making pot more widely available to the public, testing for safety, purity, potency and active ingredients is adding to the legitimacy of a drug once on the outlaw fringes of society. (AP Photo/Elaine Thompson, File)